This is really feature rich and a satisfying ski resort sim. I like that I always have clear goals to work towards, and new research and buildings to unlock.
The UX has some rough edges, particular with creating runs and roads. A couple I ran into: there is undo, but no redo. If you accidentally undo something, you need to rebuild it as far as I can tell. Also, trying to make flat cat tracks was really frustrating with my understanding of the tools. A tool for automatically creating a flat(ish) cat track between two points would be really nice.
I could see myself sinking a lot of time into this if the polish catches up with the amount of features, nice work!